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any issues with your water paramaters and the bottom feeders are the first to have issues.

I dont see that the ammonia was tested. But first and foremost, you really should try and get the Liquid Master Test Kit by API. Those results are far more accurate than those strips. The strips are not reliable.

So to guess....
ammonia spike from dead fish/tank issues....causing the deaths.
bad batch of fish. I've had 11 cory's over the past month or so, and 4 were just not strong enough for the transition of tank to tank. So now I wait about 3/4 days to purchase the fish to let the strong ones survive the initial shock of being transported to the lfs.

In other concerns that I notice.
Your tiger barbs and angel more than likely won't work out well once that angel grows and its fins get all big and "flowy" barbs love to nip at slower fish/long fins...and it'll be way to tempting for them not to harass your angel.

Yeah, I ran out my ammonia tests so I need to grab some more today after work, I'll pick up that Liquid Master Test as well. Thanks for the suggestion

I'll verify that my water is stable and then try adding some more. I just feel so bad so I want to make sure I'm not bring a fish home to it's inevitable death

As for my angels and barbs, I thought the same thing but I read a few other posts on these forums saying that keeping the barbs in a decent sized school will keep the nipping to each other. So far they've been leaving my angelfish alone and focusing on each other but I am keeping my eyes on them :-D

Okay, so after getting the Liquid Master Test and doing a 50% water change this morning, my nitrite is at 0 ppm, my ammonia is at 0 ppm and my nitrates are between 5 and 10 ppm. So I'll do another minor water change tomorrow to lower the nitrates and then try adding some more cory.

Ah okay, that makes sense cause I know I need an additional filter regardless of my nitrate level so I'll pick one up tonight. Thanks for your insight :)

And yeah, I still haven't noticed my barbs harrassing any other fish. They are still small so the nipping may change as they get larger but they travel in their pack of 5 and mainly just nip at each other for the time being.